Abby Lee Miller, who spent eight months in federal prison, is sharing her advice with Felicity Huffman, should she end up behind bars herself.
Prosecutors are demanding Huffman get at least four months of prison time after she agreed to plead guilty in the college admissions scandal.
In an interview with Inside Edition, Miller, who shot to fame on "Dance Moms," said Huffman should "take a deep breath."
"If you need a consultant, I'm your girl," she added.
Miller served eight months in federal prison after pleading guilty to bankruptcy fraud and was released in March 2018. She said her experience in prison was not what she expected.
"When I went in, I was so afraid of what would happen with the other inmates," such as fights, but "that wasn't the case at all," she said. "I met some of the kindest, nicest, most intelligent women that I've ever met in my life."
But she added, "She's a big star and I think when she gets there, they're going to be out for her. And I don't necessarily mean the other inmates, I think they will welcome her with open arms. ... It was definitely the guards. They're supposed to call you by your name or by your number. They would say, 'Where's that Dance Moms lady? Where's that dance lady? We're going to get her.'"
Her final advice? "Be respectful of everyone. Keep a very low profile. Be kind to people. Tell your story but listen."
Huffman was taken into custody last month and charged with conspiracy to commit mail fraud and honest services mail fraud.
After she agreed to a plea deal Monday, the "Desperate Housewives" star said in a statement that she was "in full acceptance of my guilt, and with deep regret and shame over what I have done, I accept full responsibility for my actions and will accept the consequences that stem from those actions."
Huffman was right to agree to plead guilty, said attorney Royal Oakes, who is not representing Huffman.
"She absolutely did the right thing in cutting a plea deal," he told Inside Edition. "She's showing remorse, she's setting up the rehabilitation of her public image. ... Look at Martha Stewart, she went to prison and things worked out just fine."
Now the question is whether fellow actress Lori Loughlin will agree to a deal too. Loughlin and her husband, designer Mossimo Giannulli, are also facing jail time in the case.
The couple is accused of paying $500,000 to get their daughters into the University of Southern California.
Loughlin and Giannulli were indicted on fraud and money laundering charges in Boston on Tuesday. They were charged last month with conspiracy to commit mail fraud, but the new indictment on Tuesday added the money laundering charge.
They have not commented publicly about the accusations.
As for Loughlin's situation, Miller said, "They don't like you to fight it. They like you to say, 'I was wrong, punish me, I'll do my time and let's move on.'"